8K technology was actually simultaneously announced with 4K when it debuted at CES in 2012. As for 1080p, and I know I am going to be in the minority with this statement, but I was never all that impressed with 1080p HD sets. They were certainly an upgrade from CTR TV's as far as resolution, but I didn't like a lot of the artifacting and crappy color gradations from them. However, with that said, I have been impressed with 4K. The most surprising thing is that unlike HD sets where there were maybe only a few that I liked, I seem to be impressed with the resolution and color reproduction from almost every 4K set I have had the pleasure to view. And that is with a crappy big box store feed! It is said that at normal viewing distances that the human eye can't detect the difference between 4K and 8K, but I beg to differ. Even at roughly an 8 foot distance I can still see pixilation in 4K resolution. Up close you can see it even more so. It is still very impressive though, don't get me wrong.
I still have my old 32" Panasonic Tau CRT TV because I refused to buy into an industry where technology was moving so fast. As soon as prices dropped on 1080p HD, 3D came out. Then the prices dropped on 3D HD and then 4K came out. Now I am faced with the decision to either buy into 4K or wait for 8K. If it were 4K I'd like to wait for a 4K OLED TV (w/P-OLED and W-OLED) with 3D because yes, there are a couple movies that I enjoy watching in 3D. That, and their processors
generally lead to better picture quality, even in 2D viewing.
4K is VERY tempting, and I have
definitely waited long enough to upgrade. But do I want to buy into 4K if/when the industry and all content is eventually going to move toward 8K? I don't know. I guess I'll be holding into my old CRT for a while yet (at least another 10 years lol).

Oh well, at least I still get great color reproduction from it.